<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像盒子 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        label-width="0px"
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <el-form-item prop="username">
          <el-input
            prefix-icon="iconfont icon-user"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            prefix-icon="iconfont icon-user icon-3702mima"
            v-model="loginForm.password"
            type="password"
            @keyup.enter.native="handleEnter"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单的数据对象
      loginForm: {
        username: "",
        password: ""
      },
      // 登录表单验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "用户名长度需在 3 到 10 个字符",
            trigger: "blur"
          }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          {
            min: 6,
            max: 18,
            message: "密码长度需在 6 到 18 个字符",
            trigger: "blur"
          }
        ]
      }
    };
  },
  mounted() {},
  methods: {
    // 重置表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    // 登录验证
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) {
          return;
        }
        // 解构赋值
        const { data: res } = await this.$http.post("login", this.loginForm);
        // console.log(res);
        if (res.meta.status !== 200) {
          return this.$message.error("登录失败");
        }
        // this.$message.success("登录成功");
        // 登录成功后要做的事情
        // 1.将登录成功之后的token,保存到客户端的sessionStorage中
        // 1.1 项目中除了登录之外的其他API接口 必须在登录之后才能访问
        // 1.2 token只应在当前的网站打开期间生效 所以token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        window.sessionStorage.setItem("username", res.data.username);
        // 2.通过编程式导航跳转到后台主页 路由地址是 /home
        this.$router.push("/home");
      });
    },
    // 用户在输入密码后按下回车键进行判断
    handleEnter() {
      this.login();
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 5px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
